Now, the actress, bestselling author, and veganism advocate wants shoppers to know why she’d rather go naked than wear wool . In a new campaign for People for the Ethical Treatment of Animals , Silverstone strips down in protest of the contentious fiber, which, despite its natural, minimally processed, biodegradable nature, has been pilloried in the past for contributing to widespread animal abuse on sheep farms. Shot by celebrity photographer Brian Bowen Smith, a billboard of Silverstone currently hangs just outside Times Square, at the intersection of 40th Street and Eighth Avenue, just before holiday-shopping season kicks into gear.